An Ongoing Giant NIR flare of the FSRQ HB891420+326

ATel #17792; L. Carrasco, G. Escobedo, L. Felix , A. Porras, E. Recillas;(INAOE, Mexico)
on 11 May 2026; 04:47 UT
Credential Certification: LUIS CARRASCO (carrasco@inaoep.mx)

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We report on an ongoing Giant NIR flare of the intermediate redshift (z=0.682) Blazar [HB89]1420+326, We observed the source at NIR wavelengths from May 6th to May 9th,2026 (JD 2461166 to JD2461169), we found the source with monotonically increasing NIR fluxes in this lapse. for the last night, the observed fluxes corresponded to J = 12.255 +/- 0.04, H = 11.407 +/- 0.04 and Ks= 10.617 +/- 0.04. Previously, on JD2460834.73, the observed flux in H corresponded to H = 14.335 +/- 0.05, then flux had increased by a factor of 15 in such lapse. Furthermore, The source was not detected in the 2mass Sky Survey at a flux limit H ~ 17.5. Then, the source has increased its flux by a factor of at least 270 in this longer lapse. The source has shown flaring activity in the past (see ATels #12201, #12277, #12379, #12866,#12941,#13028). Our observations are carried out with the 2.1m telescope of the Guillermo Haro Observatory operated by the National Institute for Astrophysics, Optics and Electronics (Mexico), equipped with the instrument CANICA a NIR camera. We encourage further multi-wavelength coverage.